preventing lipid peroxidation 11,12) .Aquatic plants including seaweeds and microalgae contain various natural antioxidants such as polyphenols, carotenoids, fucoxanthin (Fx) and fucosterol, which play an essential role in preventing lipid peroxidation 13) . Laminaria japonica, a common edible brown seaweed, prossesses various active ingredients such as organic iodine, alginates, laminarin, fucoidan and fucoxanthin 14,15) . The lipid content of Laminaria japonica (L. japonica oil, LO) is generally low, but it contains high level of EPA and arachidonic acid 16) . As a marine diatom with fast growth rate and high